SCR Rain or Leak Alarm (CB22097E)

This sensitive circuit was found in old documentation. The SCR can be any of the 106 series and the transistor a BC548.

Tuning Converter (CB22030E)
We found this circuit in an old English documentation. Transistors support modern equivalents. The circuit...
Active Cut-Out Amplifier (CB15422E)
The amplifier shown in the figure was obtained from the Anlog Devices linear integrated circuits...
Tuned Collector Oscillator (CB25587E)
This LC circuit oscillator was found in the July 1993 issue of Electronics Now magazine. The...